GB441438A - Improvements in or relating to piezo electric crystals - Google Patents

Improvements in or relating to piezo electric crystals

Info

Publication number
GB441438A
GB441438A GB11159/35A GB1115935A GB441438A GB 441438 A GB441438 A GB 441438A GB 11159/35 A GB11159/35 A GB 11159/35A GB 1115935 A GB1115935 A GB 1115935A GB 441438 A GB441438 A GB 441438A
Authority
GB
United Kingdom
Prior art keywords
shows
section
crystal
cut
piezo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB11159/35A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB441438A publication Critical patent/GB441438A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02007—Details of bulk acoustic wave devices
    • H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
    • H03H9/02023—Characteristics of piezoelectric layers, e.g. cutting angles consisting of quartz
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
    • H03H9/19—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of quartz

Abstract

441,438. Piezo - - electric crystals. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London.-(Assignees of Baldwin, C. F. ; 100, Manheim Avenue, Oaklyn, and Bokovoy, S. A. ; 705B, Woodlynne Avenue, West Collingwood, both in New Jersey, U.S.A.) April 10, 1935, No. 11159. Convention date, April 21, 1934. [Class 40 (v)] A piezo-electric section is cut so that its electrode faces are askew with respect to the X, Y and Z axes of the mother crystal. This gives it a fundamental frequency which is high relative to its thickness, and a predetermined temperature - coefficient independent of the relation between thickness and diameter. Fig. 3 shows in plan a crystal section a out along a line f f making an angle w with a mechanical axis, whilst Fig. 4 shows the angle v made by the same section with the optic axis z z. Fig. 5 shows in perspective the manner in which one section 13 is cut from the natural crystal, leaving the parts b, c unused. Fig. 10 shows how, by suitable selection of the two angles v, w, it is possible to cut a crystal oscillator having either a zero or a positive or negative temperature-coefficient.
GB11159/35A 1934-04-21 1935-04-10 Improvements in or relating to piezo electric crystals Expired GB441438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US441438XA 1934-04-21 1934-04-21

Publications (1)

Publication Number Publication Date
GB441438A true GB441438A (en) 1936-01-20

Family

ID=21930736

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11159/35A Expired GB441438A (en) 1934-04-21 1935-04-10 Improvements in or relating to piezo electric crystals

Country Status (1)

Country Link
GB (1) GB441438A (en)

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